Assessment of residual soil properties for slope stability analysis
Slope instability is a common natural geological hazard in tropical countries like Malaysia, with abundant residual soil and frequent rainfall. Over the years, these rainfalls have induced instabilities that lead to significant human and economic loss. To reduce the expected disastrous impacts due t...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
GEOMATE International Society
2021
|
| Subjects: | |
| Online Access: | http://eprints.utm.my/94809/1/RafiUllah2021_AssessmentofResidualSoilProperties.pdf |
| _version_ | 1796865896149417984 |
|---|---|
| author | Ullah, Rafi Abdullah, Rini Asnida Kassim, Azman Mohd. Yunus, Nor Zurairahetty Sendo, Hiroshi |
| author_facet | Ullah, Rafi Abdullah, Rini Asnida Kassim, Azman Mohd. Yunus, Nor Zurairahetty Sendo, Hiroshi |
| author_sort | Ullah, Rafi |
| collection | ePrints |
| description | Slope instability is a common natural geological hazard in tropical countries like Malaysia, with abundant residual soil and frequent rainfall. Over the years, these rainfalls have induced instabilities that lead to significant human and economic loss. To reduce the expected disastrous impacts due to rainfall-induced slope failure characterization of residual soil is necessary for evaluation of slope stability assessment. Therefore, this study aims to characterize the residual soil for numerical modelling of rainfall-induced slope failure and preliminary slope stability assessment so that future slope failure can be reduced. A series of experiments involving index properties tests and engineering properties tests were carried out on the residual soil samples collected from a slope located in Universiti Teknologi Malaysia (UTM). Based on the particle size distribution and consistency the soil can be classified as high plasticity silt (MH). The maximum dry unit weight and optimum moisture content are 13.17kN/m3 and 30 %, respectively. Saturated hydraulic conductivity from the falling head test is 2.32055E-07 m/s, while the saturated gravimetric water content was 54%. The effective cohesion and angle of the internal fraction were 8 kPa and 32°, respectively. The average undrained shear strength and unconfined compressive strength were 105 kPa and 43 kPa, respectively. The result obtained in this study was utilized for the preliminary rainfall slope stability assessment in tropical residual soils by simulating rainfall of different intensities and duration on a typical slope profile using PLAXIS 2d. The results show that due to the low hydraulic conductivity and fine-grained nature of the soil, the slopes in the study area are more critical to the low intensity and long duration rainfall events (I≤4Ks). The highly intense and short-duration rainfall (I≥8Ks) has no significant effect on the safety of the soil, as most of the precipitation will contribute to runoff, and only a minor amount of water will infiltrate into the slope. |
| first_indexed | 2024-03-05T21:04:03Z |
| format | Article |
| id | utm.eprints-94809 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T21:04:03Z |
| publishDate | 2021 |
| publisher | GEOMATE International Society |
| record_format | dspace |
| spelling | utm.eprints-948092022-04-29T22:27:21Z http://eprints.utm.my/94809/ Assessment of residual soil properties for slope stability analysis Ullah, Rafi Abdullah, Rini Asnida Kassim, Azman Mohd. Yunus, Nor Zurairahetty Sendo, Hiroshi TA Engineering (General). Civil engineering (General) Slope instability is a common natural geological hazard in tropical countries like Malaysia, with abundant residual soil and frequent rainfall. Over the years, these rainfalls have induced instabilities that lead to significant human and economic loss. To reduce the expected disastrous impacts due to rainfall-induced slope failure characterization of residual soil is necessary for evaluation of slope stability assessment. Therefore, this study aims to characterize the residual soil for numerical modelling of rainfall-induced slope failure and preliminary slope stability assessment so that future slope failure can be reduced. A series of experiments involving index properties tests and engineering properties tests were carried out on the residual soil samples collected from a slope located in Universiti Teknologi Malaysia (UTM). Based on the particle size distribution and consistency the soil can be classified as high plasticity silt (MH). The maximum dry unit weight and optimum moisture content are 13.17kN/m3 and 30 %, respectively. Saturated hydraulic conductivity from the falling head test is 2.32055E-07 m/s, while the saturated gravimetric water content was 54%. The effective cohesion and angle of the internal fraction were 8 kPa and 32°, respectively. The average undrained shear strength and unconfined compressive strength were 105 kPa and 43 kPa, respectively. The result obtained in this study was utilized for the preliminary rainfall slope stability assessment in tropical residual soils by simulating rainfall of different intensities and duration on a typical slope profile using PLAXIS 2d. The results show that due to the low hydraulic conductivity and fine-grained nature of the soil, the slopes in the study area are more critical to the low intensity and long duration rainfall events (I≤4Ks). The highly intense and short-duration rainfall (I≥8Ks) has no significant effect on the safety of the soil, as most of the precipitation will contribute to runoff, and only a minor amount of water will infiltrate into the slope. GEOMATE International Society 2021-10 Article PeerReviewed application/pdf en http://eprints.utm.my/94809/1/RafiUllah2021_AssessmentofResidualSoilProperties.pdf Ullah, Rafi and Abdullah, Rini Asnida and Kassim, Azman and Mohd. Yunus, Nor Zurairahetty and Sendo, Hiroshi (2021) Assessment of residual soil properties for slope stability analysis. International Journal of GEOMATE, 21 (86). pp. 72-80. ISSN 2186-2982 http://dx.doi.org/10.21660/2021.86.j2282 DOI:10.21660/2021.86.j2282 |
| spellingShingle | TA Engineering (General). Civil engineering (General) Ullah, Rafi Abdullah, Rini Asnida Kassim, Azman Mohd. Yunus, Nor Zurairahetty Sendo, Hiroshi Assessment of residual soil properties for slope stability analysis |
| title | Assessment of residual soil properties for slope stability analysis |
| title_full | Assessment of residual soil properties for slope stability analysis |
| title_fullStr | Assessment of residual soil properties for slope stability analysis |
| title_full_unstemmed | Assessment of residual soil properties for slope stability analysis |
| title_short | Assessment of residual soil properties for slope stability analysis |
| title_sort | assessment of residual soil properties for slope stability analysis |
| topic | TA Engineering (General). Civil engineering (General) |
| url | http://eprints.utm.my/94809/1/RafiUllah2021_AssessmentofResidualSoilProperties.pdf |
| work_keys_str_mv | AT ullahrafi assessmentofresidualsoilpropertiesforslopestabilityanalysis AT abdullahriniasnida assessmentofresidualsoilpropertiesforslopestabilityanalysis AT kassimazman assessmentofresidualsoilpropertiesforslopestabilityanalysis AT mohdyunusnorzurairahetty assessmentofresidualsoilpropertiesforslopestabilityanalysis AT sendohiroshi assessmentofresidualsoilpropertiesforslopestabilityanalysis |